z wrote:

-snip-
the local poop boys has a little spray for frozen car locks that
claims to thaw and lubricate, but I haven't tried it. the business end
is designed to go into a keyhole, though.

For door locks I was amazed. Got to use it last winter. A 1/4
second shot worked its magic.

for the OP- I think alcohol in a spray bottle would be more
economical.

Jim